This dataset includes psychometric curves of twenty-nine participants (M = 29.38 years, SD = 5.52, 17 females). These curves were constructed by analysing response proportions at precise intervals of 0.1 degrees, showing a preference for the comparison circle being larger than the target circle. The logistic function was employed to quantify the probability (P) of perceiving the comparison circle as larger than the target circle. The color coding in the figure corresponds to the different conditions: small inducer (red), large inducer (green), and no inducer (gray).

This dataset contains raw behavioral responses of 29 participants (M = 29.38 years, SD = 5.52, 17 females). The experiment was aimed to test the strength of Ebbinghaus illusion. The independent variables were the size of Ebbinghaus inducers (small inducer, large inducer, no inducer) and the size of target circle (small, large). During the experiment, participants were asked to judge whether the comparison circle was larger or smaller than the test circle. Each row in the dataset represents one trial. Below is a description of the columns: 1. Block: Indicates the experimental condition (1: No inducer - Small target, 2: No inducer - Large target, 3: Small inducer - Small target, 4: Small inducer - Large target, 5: Large inducer - Small target, 6: Large inducer - Large target). 2. Inducer Size: Indicates the inducer size (No inducer, Small inducer, Large inducer) 3. Target Size: Indicates the target size (Small target, Large target). 4. Comparison Circle Size: The size of the comparison circle presented on the screen, measured in degrees of visual angle. 5. Accuracy: 1 for correct responses, 0 for incorrect responses. 6. Pressed Key: 'j' for smaller responses, 'k' for larger responses. 7. Labelled Key: Represents the proportion of larger responses (1 for larger, 0 for smaller). 8. Reaction Time: The time (in milliseconds) between the presentation of the comparison circle and the participant’s key press. 9. Distractor Sizes: The sizes of the seven distractor circles on the screen, measured in degrees of visual angle. 10. Distractor Average Size: The average size of the seven distractor circles. 11. Target Location: The coordinates of the target position in each trial.

This dataset contains raw behavioral responses of 29 participants (M = 29.38 years, SD = 5.52, 17 females). The experiment was aimed to test the strength of Object-Substitution Masking (OSM). The independent variables were the size of Ebbinghaus inducers (small inducer, large inducer), viewing condition (simultaneous viewing, delayed viewing), target circle size (small, large) and congruency (congruent, incongruent). In each trial, two of the eight circles were surrounded by Ebbinghaus inducers: one was designated as the target and the other as the nontarget stimulus. Trials where the target and nontarget stimuli were the same size were categorized as congruent, while those with different-sized target and nontarget stimuli were classified as incongruent. During the experiment, participants were presented with a size-discrimination task where they supposed to identify the size of the target. Each row in the dataset represents one trial. Below is a description of the columns: 1. Mask Type: Indicates the viewing condition (simultaneous viewing, delayed viewing) 2. Inducer Size: Indicates the inducer size (Small inducer, Large inducer). 3. Target Size: The size of the target circle (Small target, Large target). 4. Nontarget Size: The size of the nontarget circle (Small nontarget, Large nontarget). 5. Congruency: Indicates the congruency of sizes of target and nontarget stimuli (congruent, incongruent). 6. Accuracy: 1 for correct responses, 0 for incorrect responses. 7. Pressed Key: 'j' for small responses, 'k' for large responses. 8. Reaction Time: The time (in milliseconds) between the presentation of the response window and the participant’s key press. 9. Distractor Sizes: The sizes of the six distractor circles on the screen, measured in degrees of visual angle. 10. Distractor Average Size: The average size of the six distractor circles. 11. Target Location: The coordinates of the target position in each trial. 12. Nontarget Location: The coordinates of the nontarget position in each trial.

This dataset includes psychometric curves of twenty-nine participants (M = 29.38 years, SD = 5.52, 17 females). These curves were constructed by analysing response proportions at precise intervals of 0.1 degrees, showing a preference for the comparison circle being larger than the target circle. The logistic function was employed to quantify the probability (P) of perceiving the comparison circle as larger than the target circle. The color coding in the figure corresponds to the different conditions: small target (red) and large target (blue).

This dataset contains raw behavioral responses of 29 participants (M = 29.38 years, SD = 5.52, 17 females). Participants were given a size averaging paradigm. Eight green circles were presented on the screen and participants were asked to indicate whether the comparison circle was larger or smaller than the average size of all eight circles. Three out of eight circles were assigned as target circles, and their sizes were manipulated to be either small or large. Each row in the dataset represents one trial. Below is a description of the columns: 1. Target size: Indicating the size of first target, in degrees of visual angle. 2. Target2 size: Indicating the size of second target, in degrees of visual angle. 3. Target3 size: Indicating the size of third target, in degrees of visual angle. 4. Comparison Circle Size: The size of the comparison circle presented on the screen, measured in degrees of visual angle. 5. Small Overall Average: The average size of all circles in small target conditions. 6. Large Overall Average: The average size of all circles in large target conditions. 7. Accuracy: 1 for correct responses, 0 for incorrect responses. 8. Pressed Key: '' for smaller responses, '>' for larger responses. 9. Labelled Key: Represents the proportion of larger responses (1 for larger, 0 for smaller). 10. Reaction Time: The time (in milliseconds) between the presentation of the comparison circle and the participant’s key press. 11. Distractor Sizes: The sizes of the five distractor circles on the screen, measured in degrees of visual angle. 12. Distractor Average Size: The average size of the five distractor circles. 13. Target Location: The coordinates of the first target position in each trial. 14. Target2 Location: The coordinates of the second target position in each trial. 15. Target3 Location: The coordinates of the third target position in each trial.

This dataset contains raw behavioral responses of 28 participants (M = 29.32 years, SD = 5.62, 17 females). Participants were given a size averaging paradigm. Eight green circles were presented on the screen and three out of eight circles were surrounded by Ebbinghaus inducers. The independent variables were the size of Ebbinghaus inducers (small inducer, large inducer), viewing condition (simultaneous viewing, delayed viewing), and distractor average size (small, large).During the experiment, participants were asked to indicate whether the comparison circle was larger or smaller than the average size of all eight circles. Each row in the dataset represents one trial. Below is a description of the columns: 1. Target Type: Indicating the presence of target either present (present) or absent (mask only). 2. Mask Type: Indicating the experimental conditions: 1: Simultaneous-Small Inducer-Small Distractor Average-Target Present, 2: Simultaneous-Small Inducer-Large Distractor Average-Target Present, 3: Simultaneous-Large Inducer-Small Distractor Average-Target Present, 4: Simultaneous-Large Inducer-Large Distractor Average-Target Present, 5: Delayed-Small Inducer-Small Distractor Average-Target Present, 6: Delayed-Small Inducer-Large Distractor Average-Target Present, 7: Delayed-Large Inducer-Small Distractor Average-Target Present, 8: Delayed-Large Inducer-Large Distractor Average-Target Present, 9: Simultaneous-Small Inducer-Small Distractor Average-Mask only, 10: Simultaneous-Small Inducer-Large Distractor Average-Mask only, 11: Simultaneous-Large Inducer-Small Distractor Average-Mask only, 12: Simultaneous-Large Inducer-Large Distractor Average-Mask only, 13: Delayed-Small Inducer-Small Distractor Average-Mask only, 14: Delayed-Small Inducer-Large Distractor Average-Mask only, 15: Delayed-Large Inducer-Small Distractor Average-Mask only, 16: Delayed-Large Inducer-Large Distractor Average-Mask only. 3. Inducer size: Indicating the size of inducer either 0.7 (small inducer) or 1.3 (large inducer) degrees of visual angle. 4. Target size: Indicating the size of first target, in degrees of visual angle. 5. Target2 size: Indicating the size of second target, in degrees of visual angle. 6. Target3 size: Indicating the size of third target, in degrees of visual angle. 7. Comparison Circle Size: The size of the comparison circle presented on the screen, measured in degrees of visual angle. 8. Small Overall Average: The average size of all circles in small distractor average conditions. 9. Large Overall Average: The average size of all circles in large distractor average conditions. 10. Accuracy: 1 for correct responses, 0 for incorrect responses. 11. Pressed Key: '' for smaller responses, '>' for larger responses. 12. Labelled Key: Represents the proportion of larger responses (1 for larger, 0 for smaller). 13. Reaction Time: The time (in milliseconds) between the presentation of the comparison circle and the participant’s key press. 14. Distractor Sizes: The sizes of the five distractor circles on the screen, measured in degrees of visual angle. 15. Distractor Average Size: The average size of the five distractor circles. 16. Target Location: The coordinates of the first target position in each trial. 17. Target2 Location: The coordinates of the second target position in each trial. 18. Target3 Location: The coordinates of the third target position in each trial.

This dataset includes psychometric curves of 28 participants (M = 29.32 years, SD = 5.62, 17 females) . These curves were constructed by analysing response proportions at precise intervals of 0.1 degrees, showing a preference for the comparison circle being larger than the target circle. The logistic function was employed to quantify the probability (P) of perceiving the comparison circle as larger than the target circle. The color coding in the figure represents the different conditions: small inducer – simultaneous viewing (solid red line), large inducer – simultaneous viewing (solid green line), small inducer – delayed viewing (dashed red line), and large inducer – delayed viewing (dashed green line).